#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>

int main()
{
	int s = 0;
	scanf("%d", &s);

	double TimeWalk = 0;
	double TimeCab = 0;
	TimeWalk = s / 1;
	TimeCab = 10 + s / 10;
	if (TimeCab > TimeWalk)
	{
		printf("w");
	}
	else
	{
		printf("v");
	}
	return 0;
}